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    Electronic States of Silicene Allotropes on Ag(111)
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    † Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche, Strada Statale 14 km 163.5, I-34149 Trieste, Italy
    § Elettra Sincrotrone Trieste, Strada Statale 14 km 163.5, I-34149 Trieste, Italy
    ⊥ ETSF and Dipartimento di Fisica, Università degli Studi di Milano, Via Celoria, 16, I-20133 Milano, Italy
    *E-mail: [email protected]
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    ACS Nano

    Cite this: ACS Nano 2017, 11, 1, 975–982
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    https://doi.org/10.1021/acsnano.6b07593
    Published December 29, 2016
    Copyright © 2016 American Chemical Society
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    Abstract

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    Silicene, a honeycomb lattice of silicon, presents a particular case of allotropism on Ag(111). Silicene forms multiple structures with alike in-plane geometry but different out-of-plane atomic buckling and registry to the substrate. Angle-resolved photoemission and first-principles calculations show that these silicene structures, with (4×4), (√13×√13)R13.9°, and (2√3×2√3)R30° lattice periodicity, display similar electronic bands despite the structural differences. In all cases the interaction with the substrate modifies the electronic states, which significantly differ from those of free-standing silicene. Complex photoemission patterns arise from surface umklapp processes, varying according to the periodicity of the silicene allotropes.

    Copyright © 2016 American Chemical Society

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    • ARPES data taken at 130 and 135 eV photon energies; DFT calculations for the band dispersion and density of states of the silicene allotropes (PDF)

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    ACS Nano

    Cite this: ACS Nano 2017, 11, 1, 975–982
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acsnano.6b07593
    Published December 29, 2016
    Copyright © 2016 American Chemical Society
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